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In order to compare the yearly incomes in two professions a survey was made among 100 men in each. In one sample the mean income is S6000 with a standard deviation of 8700; in the second sample the mean is S6200 with a standard deviation of S400. To weigh the claim that the mean salary in the second profession is no larger than in the first profession, calculate the prob-value.
Mazes and smells. Can pleasant smells improve learning? Researchers timed 21 subjects as they tried to complete paper-and-pencil mazes.
An experiment involves rolling a fair six-sided die repeatedly. How many times must the die be rolled for a {6} to result at least once with probability greater than or equal to 0.6 ?
In a variation on Example 9.10, we use the observation vector Y = Y(n) = [Y1 ··· Yn] to estimate X = X1. The 21-dimensional vector X has correlation matrix RX with i, jth element
Assume that the population of heights of treated plants is normally distributed with mean. Based on the sample, can it be concluded that is different from centimeters? Use the level of significance. Perform a two-tailed test. Then fill in the table..
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u = 80 and a standard deviation of o= 20. The researcher expects a 12 point treatment effect and plans to use a t..
find the margin of error for the given values of cs and n c0.80 s4 and n8the margin of error is round to one decimal
Find the standard deviation of this sample of numbers. Round your answer to at least two decimal places.
Construct the following syllogisms- A valid syllogism in the first figure having a universal negative conclusion and these terms: major-guarantees of marital happiness; minor-prenuptial agreements; middle-legally enforceable documents.
Formulate the null and alternative hypotheses. Determine the criterion for rejection or non-rejection of the null hypothesis.
What is the purpose for post tests? To determine how much difference exists between the treatments.
What is the probability that a randomly selected ringtone from this list is not Empire State of Mind and not I Gotta Feeling? Be sure to show how you computed this answer.
the manager of a pizza parlor claims his employeeampamp39s make an average of 4.50 per hour with a standard deviation
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